Reproducing device for graphophones.



H. R. ADAMS.

REPRODUCING DEVICE FOR GRAPHOPHO APPLICATION FILED MAY 20. IBIS Patented Apr. 22, 1919.

HENRY ROLLAN D ADAMS,

OF WAYSIIDE, TEXAS.

REPRODUCING DEVICE FOR GRAPHOPHONES.

Specification of Letters Patent.

Patented Apr. 22, 11919.

Aprlication filed May 20. 1918. Serial No. 235,604.

t ,3tl1l,fi3ll [[0 all whom it may concern i Be it known that I. l'ilcxur 1t. Air-ins, a citizen of the United States, residing at lY-ayside. in the county of .'\rmstro ng and State of Texas, have invented new and useful Improvements in Reproducing Devices for (lraphophones, of which the Itollowir is a specification.

This invention relates to reproducing levices for graphophones, and one object is to provide certain novel means for moun ng the diaphragm in order that the vibrations shall be. transmitted from each side thereof to a plurality of ducts having connection with a main duct or tone arm through which the sound passes to the horn or the like.

A further object is to provide a casing comprising a plurality of semisphcrical members with means for mounting a diaphragm across the chamber formed by said. members, and means for connecting the opposi'te sides of: the semispherical members with a common air duct, or tone arm.

A still further object is to provide certain novel means for mounting the needle and comprising a conical member carried Within. a. tapered seat and separated from said seat by a sleeve of fiber, this conical member hav ing connection with'the arm connected with the diaphragm of the reproducing device.

\Vith the foregoing and other objects in view the invention consists in the novel construction, combination, and arrangement of elements hereinafter described and claimed.

Figure 1 is a longitudinal central section llustrative. of the best practical embodiment oli my invention that I have as yet devised; the said section being on the line. 33 of Fig.

Fi 2 is a view, partly in plan and partly in section, with the upper casing section removed.

' Fig. 3 is a section taken in the plane indicated by the line 3-3 of Fig. 2.

A diaphragm 10 is mounted diametrically of a spherical chamber comprising a plurality of semis-pherical sections, aach of these sections being provided with an opening having connection with a duct through which the sound vibrations pass to a common outlet; the sections of'casiug are desig ,nated 11, and 12, and each section has connected therewith a duct 13 having a flanged most satisfactory manner.

portion it near one end, the extreme end of the duct entering an aperture 15 pio ided in each side wall of the. common outlet, which may be referred to as the tone arm, and is designated 11'). The ducts 13 arc of about the form shown, and positive connection with the common outlet 16 is maintained by means of a threaded annular member 1? connecting the casing sections 11 and 12. Tl a diaphragm is mounted between these sections. and any suitable gasket or gasket-s 18 are located. at this point. Casing section 11 carries an outwardly extending tlange l5) internally threaded and engaged by the ring member 17 in securing the easing sections together. The casing as a whole. including ducts 13. is movable toward and away from the record. in view oi" the, connection at 20.

The diaphragm 10 has connected there with, an arm passing through a packing member 2i in the wall of a casing. and having connection with the cone member .25 provided at one end with an extension 20 constituting a needle holder. The needle is shown at 27. The cone member is under slight pressure, this pressure being exerted by spring 28 mounted as shown. Between the cone member and the casing 30 therefor is a fiber sleeve 31 serving to eliminate. so for as possible, those vibrations which interfere with the proper movementof the. dias phragm for reproducing the record in the The object in providing an air chamber on each side of the diaphragm is to producea larger volume of sound and a tone of liner quality.

What is claimed is:

In a device of the class described, a casing, a diaphragm mounted within the casing, an arm connected with the diaphragm, a needle holding device comprising a cone member, a casing therefor including a stationarycasing element and a detachable threaded element having'a bore of varying cross section, receiving the cone member, a fibrous sleeve be tween the casing and cone men'iber, a spring for retaining the cone member and sleeve in positive contact, an extension carried by the cone member, and a needle mounted in said extension.

In testimony whereof I ailix my signature.

HENRY ROLL/U1 ADAMS? 

